1. Check the power supply.
2. Check the water supply.
3. Inspect all hoses.
4. Take a look at the inlet valve.
5. Check the intake filter.
6. Inspect the nozzle.
7. Inspect the gun.
8. Check the power pump, unloader, regulator, and other valves.
Diagnosis takes this order because the things at the top of the list are more common and much easier to check. That's the good news when it comes to looking over your pressure washer. Most pressure and other performance issues will be caused by something small and simple like a clogged nozzle.
Even components like regulators and unloaders are fairly simple to replace, and can be done by confident workmen an homeowners. Once problems boil down to a power pump issue, it's usually best that the pressure washer see a shop.
Because the problems of and solutions to symptoms are so varied, we just list them below without any particular order, although we list the most common symptoms and causes first.
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